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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 12053–12067

Modeling of transient modal instability in fiber amplifiers

Benjamin G. Ward  »View Author Affiliations

Optics Express, Vol. 21, Issue 10, pp. 12053-12067 (2013)

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A model of transient modal instability in fiber amplifiers is presented. This model combines an optical beam propagation method that incorporates laser gain through local solution of the rate equations and refractive index perturbations caused by the thermo-optic effect with a time-dependent thermal solver with a quantum defect heating source term. This model predicts modal instability a fiber amplifier operating at 241, 270, and 287 Watts of output power characterized by power coupling to un-seeded modes, the presence of stable and unstable regions within the fiber, and rapid intensity variations along the fiber. The instability becomes more severe as the power is increased.

© 2013 OSA

OCIS Codes
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4480) Lasers and laser optics : Optical amplifiers
(140.6810) Lasers and laser optics : Thermal effects
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 28, 2013
Revised Manuscript: April 5, 2013
Manuscript Accepted: April 29, 2013
Published: May 10, 2013

Benjamin G. Ward, "Modeling of transient modal instability in fiber amplifiers," Opt. Express 21, 12053-12067 (2013)

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